{"product_id":"lithium-dc-system-record-pdf","title":"Lithium \u0026 DC System Record PDF — Configuration, Commissioning \u0026 Cell Balance Log","description":"\u003cp style=\"font-size:1.05em;line-height:1.7;\"\u003e\u003cstrong\u003eThe cell spread is the most useful number in a lithium bank, and no dashboard shows it to you.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eYour monitor shows a state of charge and a pack voltage. Both look healthy right up to the day one cell runs away from the others and the BMS starts disconnecting under load. The gap between your highest and lowest cell, read at the top of a charge where imbalance is widest, is what tells you that months in advance.\u003c\/p\u003e\n\n\u003cp\u003eThis record holds that number over time, alongside the configuration it belongs to: what cells, what BMS, what fuse, what each charge source is actually set to, and who signed the installation off.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#0A3F5C;border-left:4px solid #C5A059;border-radius:4px;padding:22px 24px;margin:26px 0;color:#F7F9FA;\"\u003e\n  \u003cp style=\"margin:0 0 4px;font-size:0.72em;letter-spacing:0.14em;text-transform:uppercase;color:#C5A059;font-weight:700;\"\u003eWhat you receive\u003c\/p\u003e\n  \u003cp style=\"margin:0 0 14px;font-size:1.25em;line-height:1.35;color:#FFFFFF;\"\u003eA seven-part record for the life of the bank\u003c\/p\u003e\n  \u003cul style=\"margin:0;padding-left:18px;line-height:1.75;color:#DCE6EC;\"\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eA 24-line reference page\u003c\/strong\u003e for the cell, BMS, charger and inverter figures you transcribe, with the source and page beside each\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eA 20-line as-installed record\u003c\/strong\u003e — fuse, disconnect, cable sizes, sensor positions, and what every charge source is actually set to\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003ePer-cell commissioning readings\u003c\/strong\u003e for up to sixteen cells in series, with the meter recorded\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003e16 balance entries\u003c\/strong\u003e tracking cell spread, pack-versus-sum and temperature over time\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eA BMS event register\u003c\/strong\u003e including the warnings that cleared themselves\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003e6 calculation models\u003c\/strong\u003e for spread, connection loss, deviation, surge sizing, delivered capacity and equivalent cycles\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eThe gap between the drawing and the boat\u003c\/h3\u003e\n\u003cp\u003ePart I is what your documentation says. Part II is what is actually fitted — the fuse body you read with a torch, the cable marking, the charger set point measured at the terminals rather than assumed from the menu. Most lithium problems live in the gap between those two pages, and nobody writes either of them down.\u003c\/p\u003e\n\u003cp\u003eModel E2 is the sleeper in this record: pack voltage minus the sum of the cells. A discrepancy there is not a battery problem at all. It is a connection problem, and it is measuring the resistance of a joint that is about to get hot.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#F7F9FA;border:1px solid #E1E8EC;border-left:4px solid #A2803C;border-radius:4px;padding:20px 22px;margin:26px 0;\"\u003e\n  \u003cp style=\"margin:0 0 6px;color:#0A3F5C;font-weight:700;\"\u003eNot one published voltage. Deliberately.\u003c\/p\u003e\n  \u003cp style=\"margin:0;line-height:1.7;\"\u003eCell voltages, charge currents, balance thresholds and temperature cutoffs differ by chemistry, by cell maker, by BMS and by firmware revision. A charge voltage that is correct for one cell will damage another. A low-temperature lockout that is right for one chemistry permanently plates lithium onto the anodes of the next. So this record publishes none of them — you transcribe yours once, from the documentation that came with your own cells.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eInstallation is qualified work. This is a record of it.\u003c\/h3\u003e\n\u003cp\u003eNo page here tells you to fit a fuse, torque a busbar, program a BMS, size a cable or wire a charge source. High-current DC work on a boat is governed by standards, it belongs to a qualified marine electrician, and a lithium bank is the one system aboard that can take the whole boat with it.\u003c\/p\u003e\n\u003cp\u003ePart VI is sixteen lines recording that a competent person verified the installation — and who that person was, with their qualification and the date. Those are questions to put to your electrician, not a checklist for a Saturday afternoon.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eWho it is for\u003c\/h3\u003e\n\u003cul style=\"line-height:1.75;\"\u003e\n  \u003cli\u003eOwners who have just had a lithium bank fitted and want it documented while it is fresh\u003c\/li\u003e\n  \u003cli\u003eOwners who inherited one with no paperwork and need to establish what is actually installed\u003c\/li\u003e\n  \u003cli\u003eAnyone whose insurer or surveyor has asked questions about a lithium installation\u003c\/li\u003e\n  \u003cli\u003eOwners preparing to sell, where an undocumented lithium bank is a discount waiting to happen\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eTechnical specification\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.95em;margin:12px 0 4px;\"\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;width:42%;\"\u003eProduct ID\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eAML-ELEC-2026-01\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eExtent\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e24 pages · 7 parts · 6 calculation models\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eRegister lines\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e104 across reference, as-installed, commissioning, trend and verification\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eInteractivity\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e543 live PDF form fields — 60 tick boxes and 483 entry fields\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eFormats included\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eA4 and US Letter, both fillable and print-ready\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eSystems\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eAny chemistry, up to 16 cells in series — no chemistry-specific data\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eUnits\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eUnit-neutral — you set them and record which you used\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eOffline\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eNo app, no account, no connection required once downloaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eWhat it is not\u003c\/h3\u003e\n\u003cp\u003eThis document records, structures and compares figures that you supply. It publishes no voltage, no current limit, no temperature cutoff, no fuse rating and no torque figure, and it reaches no conclusion about any installation. It is not a wiring guide, not an integration manual and not engineering advice.\u003c\/p\u003e\n\u003cp\u003eThose decisions belong to a qualified marine electrician working to the standards that apply where your vessel is flagged and used, and to the documentation supplied with your own cells. A lithium installation that is wrong does not fail gracefully.\u003c\/p\u003e\n\n\u003cp style=\"margin-top:26px;\"\u003e\u003cstrong style=\"color:#0A3F5C;\"\u003eInstant download.\u003c\/strong\u003e Your links appear on screen the moment payment clears, and arrive by email within a minute. They do not expire.\u003c\/p\u003e\n\n\u003cp style=\"font-size:0.9em;color:#5C6B75;line-height:1.65;margin-top:22px;border-top:1px solid #E1E8EC;padding-top:16px;\"\u003e\u003cem\u003e2026 Captain's Edition · Revision 1.0 · AML-ELEC-2026-01. Apex Marine Labs designs the organisational process behind good seamanship. Our documents record and organise; they do not replace a certified marine survey, an installation standard, or a qualified marine electrician.\u003c\/em\u003e\u003c\/p\u003e","brand":"Apex Marine Labs","offers":[{"title":"2026 Captain's Edition","offer_id":56014210236584,"sku":"AML-ELEC-2026-01","price":97.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/1161\/2072\/files\/apex-lithium-dc-record-01-cover.webp?v=1789749512","url":"https:\/\/apexmarinelabs.com\/products\/lithium-dc-system-record-pdf","provider":"Apex Marine Labs","version":"1.0","type":"link"}